[FS#568] First boot messages are not logged to file

[LEDE Bugs]

A new Flyspray task has been opened.  Details are below. 

User who did this - Andreas (ndvour) 

Attached to Project - LEDE Project
Summary - First boot messages are not logged to file
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Very Low
Priority - Very Low
Reported Version - lede-17.01
Due in Version - Undecided
Due Date - Undecided
Details - I'm saving logs to a file on an external partition that is mounted at boot. After rebooting with an empty log file, an inconsistency can be noticed between the output of logread and the content of the log file. The first message printed by logread is, as expected,
Mon Feb 27 20:33:15 2017 kern.info kernel: [    0.000000] Booting Linux on physical CPU 0x0
while the first message in the log file reads
Mon Feb 27 20:33:16 2017 user.notice : Added device handler type: tunnel
The first boot messages are missing from the log file. From this point on, logread and the log file are identical.
Of course this is a minor issue, but still one would expect logs to be 100% complete, regardless whether they are stored in memory or to file.

root at lede:~# cat /etc/config/system 
config system
        option hostname 'lede'
	option zonename 'Europe/Rome'
	option timezone 'CET-1CEST,M3.5.0,M10.5.0/3'
        option ttylogin '0'
        option urandom_seed '0'
        option log_remote '0'
        option log_type 'file'
        option log_file '/mnt/sda1/var/log/messages'
        option log_buffer_size '64'
        option log_size '1024'
        option conloglevel '8'
        option cronloglevel '0'
...

Start order of init scripts log and fstab has been changed to start logging as early as possible.
root at lede:~# ls -1 /etc/rc.d/S*
/etc/rc.d/S00sysfixtime
/etc/rc.d/S10boot
/etc/rc.d/S10fstab
/etc/rc.d/S10system
/etc/rc.d/S11log
/etc/rc.d/S11sysctl
...

Device: WRT1200AC
Software version: Reboot (17.01.0, r3205-59508e3)

More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=568